可变临界间隙条件下的加速车道车辆汇入模型

Vehicle Merging Model for Acceleration Lane under Condition of Changeable Critical Headway

考虑驾驶员在入口匝道加速车道上行驶过程中车辆汇入的临界间隙变化的情况,应用微分法推导求得加速车道上车辆的汇入概率模型。该模型更好地考虑了道路物理特征和主路交通状况对驾驶员汇入行为的影响,并揭示了加速车道长度、主路外侧车道车流量对于车辆汇入概率的影响规律。结果表明:当主路外侧车道流量较低时,车辆在加速车道始端较近距离内就可以寻找到可汇入间隙;而当主路流量较大时,车辆在加速车道始端汇入主路的概率大大降低。另外,随着加速车道长度的增加,驾驶员在加速车道上的汇入紧迫感下降,会导致相同位置汇入概率的降低。

Considering the vehicles＇ changeable critical headway when driving along the acceleration lane of an on-ramp,a vehicle merging model was proposed using differential method.This model well considered the effect of roads geometry characteristic and major road traffic conditions on driver＇s merging behavior. It also revealed the regularity of the effect of length of acceleration lane and traffic flow of main road shoulder lane on the merging probability.The numerical result shows that（1） When the lane has a lower traffic flow,drivers are easily to find a merging opportunity near the beginning of the acceleration lane;while a lager traffic flow arrives,the merging probability near the nose section will be significantly reduced.（2） The drivers＇ tendency to merge will reduce along with the increase of acceleration lane length,and the merging probability decreases at the same site.